Big Batteries and Small Chargers - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-08-2011, 03:01 PM   #1
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Big Batteries and Small Chargers

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Last year I built a new battery pack with 1100 ma batteries – “No more problems here!” sez I!

But here I am a year later and as I put it on my Accu-cycler – there is only 8 –10 minutes of power left – “What happened?”… Sez I?

My local guru asked the big question – “How long did you charger the battery for on it’s initial charge?”
“I don’t know… over night… Why?”

“The average charger only puts out 50 ma of power – quick math should have you charging that battery pack 20 –24 hours to reach full capacity.” Sez he.

“ BTW – MOST new charging units turn themselves OFF after 12-15 hours, so you will NEVER reach full capacity. The net result, you have just paid for a 1100 ma battery pack, which you just turned into 700 ma battery pack.”

Oh wow… not good.

Use a wall charger for the initial charge and leave it plugged in for 24 hours or so (do your own math).

Use the Accu-cycler and turn them off and then back on – after 10 hours to defeat the 15 hour timer.

However you do it – think about your batteries before you loose a plane over something so preventable.
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Old 07-08-2011, 04:02 PM   #2
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Re: Big Batteries and Small Chargers

there's more to it than that, an 1100 mah battery should ideally be charged at 110 mah. Even 50 mah for 25 hrs may not do it because these batteries are meant to be charged 1/10 of their capacity.
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Old 07-08-2011, 08:34 PM   #3
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Re: Big Batteries and Small Chargers

Buy a better charger and take the time to set up the charging profile to match your pack.
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